try global node-gyp install

appveyor.yml

@@ -4,32 +4,6 @@ environment:
   node_pre_gyp_secretAccessKey:
     secure: 1amwJJw9fu0j6dXnc5KsAQbSYf7Cjw/dapT6OZWABa6nc52grkKeLQ+DGaOfQz8i
   matrix:
-    - nodejs_version: 0.10.32
-      nw_version: 0.8.6
-      platform: x86
-      msvs_toolset: 12
-    - nodejs_version: 0.10.32
-      nw_version: 0.8.6
-      platform: x64
-      msvs_toolset: 12
-    - nodejs_version: 0.11.13
-      nw_version: 0.10.5
-      platform: x86
-      msvs_toolset: 12
-    - nodejs_version: 0.11.13
-      nw_version: 0.10.5
-      platform: x64
-      msvs_toolset: 12
-    - nodejs_version: 0.11.13
-      nw_version: 0.10.5
-      platform: x86
-      msvs_toolset: 12
-      BUILD_ARGS: --target=0.11.14
-    - nodejs_version: 0.11.13
-      nw_version: 0.10.5
-      platform: x64
-      msvs_toolset: 12
-      BUILD_ARGS: --target=0.11.14
     # custom visual studio 2014 builds
     - nodejs_version: 0.10.33
       platform: x64
@@ -69,7 +43,7 @@ install:
   - node -e "console.log(process.argv,process.execPath)"
   - npm -v
   # upgrade node-gyp to support --msvs_version=2013
-  - npm install node-gyp
+  - npm install node-gyp -g
   # clear out node-gyp header cache
   - if "%msvs_toolset%" == "14" rd /s /q %USERPROFILE%\.node-gyp
   - SET PATH=C:\Program Files (x86)\MSBuild\%msvs_toolset%.0\bin;%PATH%